The structure of neutron-rich beryllium isotopes has been investigated using different heavy-ion-induced transfer reactions. In neutron transfer reactions, the population of final states shows a strong sensitivity to the chosen core nucleus, i.e., the target nuclei
9Be or
10Be, respectively. Molecular rotational bands up to high excitation energies are observed with
9Be as the core due to its pronounced 2
α-cluster structure, whereas only a few states at low excitation energies are populated with
10Be as the core. For
11Be, a detailed investigation has been performed for the three states at 3.41, 3.89, and 3.96 MeV, which resulted in the most probable spin-parity assignments 3/2
+, 5/2
?, and 3/2
?, respectively. Furthermore, we have studied particle-hole states of
16C using the
13C(
12C,
9C)
16C reaction and found 14 previously unknown states. Using the
12C(
12C,
9C)
15C reaction, five new states were observed for
15C.
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